Add a VM defined class MirrorReference as an opaque pointer for Dart code to VM internal objects.

runtime/vm/object_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 3161 matching lines @@
     weak2.set_value(value2);
   }
   isolate->heap()->CollectAllGarbage();
   EXPECT(weak1.key() == Object::null());
   EXPECT(weak1.value() == Object::null());
   EXPECT(weak2.key() == Object::null());
   EXPECT(weak2.value() == Object::null());
 }
 
 
+TEST_CASE(MirrorReference) {
+  const MirrorReference& reference =
+      MirrorReference::Handle(MirrorReference::New());
+  Object& initial_referent = Object::Handle(reference.referent());
+  EXPECT(initial_referent.IsNull());
+
+  Library& library = Library::Handle(Library::CoreLibrary());
+  EXPECT(!library.IsNull());
+  EXPECT(library.IsLibrary());
+  reference.set_referent(library);
+  const Object& returned_referent = Object::Handle(reference.referent());
+  EXPECT(returned_referent.IsLibrary());
+  EXPECT_EQ(returned_referent.raw(), library.raw());
+
+  const MirrorReference& other_reference =
+      MirrorReference::Handle(MirrorReference::New());
+  EXPECT_NE(reference.raw(), other_reference.raw());
+  other_reference.set_referent(library);
+  EXPECT_NE(reference.raw(), other_reference.raw());
+  EXPECT_EQ(reference.referent(), other_reference.referent());
+
+  Object& obj = Object::Handle(reference.raw());
+  ASSERT(obj.IsMirrorReference());
+}
+
+
 static RawFunction* GetFunction(const Class& cls, const char* name) {
   const Function& result = Function::Handle(cls.LookupDynamicFunction(
       String::Handle(String::New(name))));
   ASSERT(!result.IsNull());
   return result.raw();
 }
 
 
 static RawField* GetField(const Class& cls, const char* name) {
   const Field& field =
@@ skipping 144 matching lines @@
   const Function& test7 = Function::Handle(GetFunction(class_a, "test7"));
   EXPECT_EQ(test1.SourceFingerprint(), test2.SourceFingerprint());
   EXPECT_NE(test1.SourceFingerprint(), test3.SourceFingerprint());
   EXPECT_NE(test3.SourceFingerprint(), test4.SourceFingerprint());
   EXPECT_NE(test4.SourceFingerprint(), test5.SourceFingerprint());
   EXPECT_NE(test5.SourceFingerprint(), test6.SourceFingerprint());
   EXPECT_EQ(test6.SourceFingerprint(), test7.SourceFingerprint());
 }
 
 }  // namespace dart